Update reinforcement_ppo.py

Author: svekars

intermediate_source/reinforcement_ppo.py

@@ -104,12 +104,11 @@
 # description and more about the algorithm itself.
 #
 
-# sphinx_gallery_start_ignore
-import warnings
-
 warnings.filterwarnings("ignore")
 from torch import multiprocessing
 
+# sphinx_gallery_start_ignore
+
 # TorchRL prefers spawn method, that restricts creation of  ``~torchrl.envs.ParallelEnv`` inside
 # `__main__` method call, but for the easy of reading the code switch to fork
 # which is also a default spawn method in Google's Colaboratory
@@ -139,7 +138,6 @@
 from torchrl.objectives import ClipPPOLoss
 from torchrl.objectives.value import GAE
 from tqdm import tqdm
-import multiprocessing
 
 ######################################################################
 # Define Hyperparameters